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Released September 16, 2016. Model 1660, 1778 Available as GSM or CDMA / 32, 128 or 256 GB / Rose Gold, Gold, Silver, Black, and Jet Black.

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Boot Loop no display

Hello Forum,

I have a problem with my Iphone 7 (qualcomm)

So i had a no service issue which i repaired (Kind of) and after replacing BBPMU i had to do a restore, on the phone i saw imei number so probably everything was soldered just fine.Till that moment device was turning on properly. So i tried to restore my phone using 3uTools and Itunes, and finally i got error -1 , and my phone was stuck on progress bar under the apple logo, nothing happened for few minutes and i decided to turn it of holding buttons. Then my phone was just looping to recovery mode, and on 3utools i clicked on EXiT recovery mode, and after that my phone is not turning on at all, on Bench power supply i can see after holding power on 60mA jumping to 200mA and turning off, and process starts again, if anyone has any idea what is the solution i’d really apericiate any kind of help :)

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You will need to re-ball the baseband CPU but being the Qualcomm model the baseband will probably be shorted internally. If it is you could try burning the short out but it doesn’t have a good success rate.

If the keypad brings up the IMEI you might just get away with re-balling the BBCPU.

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6 Comments:

the problem is with device not turning on couse of some other problem, not PPBMU, when i changed the chip everything was just fine

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ill check if tigris is shorted on 5V0Usb

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@msac1ek The baseband PMU is not the baseband CPU which I am talking about. The power readings you supplied are a signature fault for the baseband CPU.

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Are you sure that its Just it ? , Just died after not succesful restore. After hours of working properly

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The problem is there is no internal short on the board , When im turning on something Just doesnt work, ill get some measurements in few days , ill get better power cables and usb amp and voltage meter, and everything will show up. Im thinking something might died when i interrupted doing restore when it was unsuccesful. any idea what could die? Nand or something ?

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Msac1ek will be eternally grateful.
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